Wireless horn relay type car antitheft system

Abstract: A wireless horn relay type car antitheft system includes a horn relay housing internally provided with a power input and voltage regulator circuit, a radio transceiving circuit, a CPU decoding and controlling circuit, a horn relay driving circuit, a relay, and an antitheft sensor to detect any car theft behavior and drive an original horn to sound. The wireless horn relay housing has I/O terminals the same as those of an original horn relay, so can plug into the original horn relay socket; and a positive terminal in the form of a fuse plug for plugging into an original positive voltage fuse socket to obtain positive power supply, and for receiving an original fuse therein. The antitheft system also includes a wireless remote controller for remotely controlling the on and off of all circuits in the horn relay housing. The original horn may be driven by the antitheft system to produce warning sound. (end of abstract)